[Tycho?]

Unless I am horribly, horribly wrong.

Uh, Im pretty sure you are.

Sounds travells by vibrations in molecules. The closer together these molecules are, the easier it is for the vibrations to move from one molecule to another. This is why sound travels further in water than in air. In space, there are so few atoms that even if they started to vibrate, they wouldn't touch another atom to transfer the vibrations to.

Is there such a thing as a safe explosive? Like one that wont explode when you drop it, or something? I live in rural Nova Scotia, so I have plenty of land to use explosives on, and actually some practical applications for getting rid of tree stumps or dislodging rocks. Plus explosives are neat. But there is no way I am going to risk blowing my hand off for some fun. So, any explosive that is (almost) completely safe to make, assuming you dont do anything really stupid?

I have read on this a good amount, and no, it does not. It coats braincells with a fatty substance, causing them to stop working. But in 20-30 days or so, the fat wears off, and the cells can continue to work normally. So when using pot, brain cells will get coated and become usless, but as long as you stop, and stay stopped for about a month, you should technically be fine. Technically because if you are a heavy user you may have developed bad habits, because of it.

Well, one night at a party I got completely plastered. My memory just kicked out a bit after 9:00pm, and didn't kick back in until i woke up on my fiends couch the next morning.

That night I did several things. First, I hit on any female close to me. One actually made out with me, however it was one I absoultly hate. After a bit I am told I got up, said "fuck this" and walked away, leaving her crying. Which made me feel a bit better.

I couldn't walk, and at one point I apparently said "where the grass and the gravel meet, follow it to the end, and you shall find people there" I suppose I meant. "someone is by the driveway" but I will never be sure.

And a cop came. At this point I was laying on the ground. He asked "are you alright there" I replied no, then threw up.

All of this I have no memory of at all. Now the thing is, after being told about this over and over again, I visualize these events, so when I think about them I "see" them. After a while this starts to feel like real memory. But then I may get a piece of information that I didn't have before, so I realize that it wasn't just a memory, just me visualizing it. So even if after a while you start to remember, it may not be actual memory.

should be interesting.

 

one of my 1st question is where does methane come from on Titan. and pics or other visual data from it would be nice' date=' very nice.[/quote']

 

Yeah there are a bunch of hydrocarbons and other organic compounds floating around on titan in large quantities, interesting to get a closer view of that.

I have no idea what that guy is saying, but who wants to bet its him discovering that one of the fundamental principals of astronomy/physics is actually wrong, and only he realizes it? That sorta thing seems to happen a lot here, I guess we just have a bright group of people.

Here's a little project for you:

 

Using the radius of Mars' date=' and the depth and density of the atmosphere, calculate the volume of CO[sub']2[/sub] that needs to be heated. Then work out how much energy it would take to heat that volume from its current temperature to that at which the CO₂ disassociates.

My point was going to be based on this, but you said it a great deal better.

oh another way

 

i like games ' date='some FPS ones too(wolfenstein,igi,hitman......)whwre the way is complicatd and one has to find it out .

 

it happened so many tmes to me that i couldnt go to the door and frustrated myself.

after i slept i remenber scanning through all the ways and seemed to correlate which way i had to go and most of the times i would find the door or key then.

 

same things with some math problems.

 

now what do you say?[/quote']

 

Good REM sleep kinda causes your brain to re-set I think, ready for another day. So at the end of the day when you feel all crapped out or whatever, you just sleep and removes all that. I know when I've been in a mad/frustrated mood and went to bed, but only to have restless sleep, I wake up with the exact same madness/frustration as when I went to bed. When usually it would be a completely different day.

 

Sleep is an orginization time for the brain I think, just cleaning stuff up so it can funtion well the next day.

Could you rephrase this? I have no idea what you are asking.

Uh, I think you can always tell who is accelerating I think. Namely that when you accelerate, a force is applied on you, which you can feel and measure. If it was another object that was acclerating, you would not feel a force, so you would know you were not acclerating. I think.

Wespe, I fail to see how anything you've said even has to do with relativity. I have no idea what you are trying to prove here.

Time synconization for stationary clocks? What does this have to do with anything? Why would you need time syncronization for stationary clocks, when time dilation comes into effect with a moving object? That the astronaut is moving in that joke of a flash animation would certainly not make a difference. Why does it matter if he can get the same average time?

Damn it, and why does every second person feel they are so intelligent that they can disprove one of the most basic theories of physics, while having no education in the subject whatsoever? I stopped thinking I could do that before I was in middle school.

I dont see why they can't become tidally locked. For one, I dont see any reason why a planet would need a day night cycle to be habitable, life would just be different there. And even if two bodies were tidally locked, they would be orbiting around the center of gravity of the two objects. So while the face of one body may always look on the same face of the other body, they would still be orbiting so sunlight would still reach the whole surface. Its like the moon around the earth, it is tidally locked, but it orbits around so everywhere on its surface can still get sunlight.

Unless I read your post wrong, which is highly possible considering how much of it I understood (probably not enough).

Around 30. 20 triangle pushups, where you put your arms together so that your thumb and forefinger meet. I do those so my hands are around my stomach, pretty tough. Also 20 with closed fists. I usually stop those because my fists hurt.

... And this is probably the only place (this site) that I can actually say 'cingularities' and have people understand what I'm saying. ...

**cough**

You uh, spelled singularity wrong.

Can you actually see this in real life? I've only seen it on TV, as TV has a frame rate. I've never once seen car wheels do that.

Tycho' date='

 

I don't mean to be rude or insulting, but you obviously have a limited electrical background. Even something as small as a penny is going to require thousands of amperes at relatively high voltages. The type of materials and equipment to produce this is dangerous and complicated. There is nothing wrong with experimenting with electrical energy, but only after extensive safety training and basic theory has been understood.

 

There are many experiments that can be done to show the same principles as a rail gun, and will also provide you with the experience and training to work into larger projects. All I'm saying is walk before you run. Try the Gauss Gun from my link, its lots of fun and very educational. Then buy yourself a basic electrical lab and go from there. Good luck![/quote']

 

Thank you. This is actually exactly what I needed to know. I have no idea on the amount of current required to move a penny, which is what I was asking. I would agree that thousands of amperes is well above the scope of my project. Heh, I wish I hadn't called my project "Rail Guns". Oh well, live and learn.

How far in the future is this supposed to be?

a pole pig is another name for a distribution transformer' date=' you`ll often see them at the top of telegraph poles and with the 2 ceramic insulators they look a bit like a pig

it`s a slang term used by coilers.

your car bat CAN be made to work, but there`s not much in the way of stepup transformers from 12v to several Kilovolts without extensive switchmode circuitry.

you`re better of starting with mains elec, then you`ll find the door`s wide open for transformer choice [/quote']

 

Stepup transformers?

Mains elec?

 

I do not know what these terms mean.

I'd say go for the quantum one, or the energy conversion one. You know about the whole human being=a fuckload of energy thing, which is really the main problem behind it. Quantum stuff possible on small scale, larger scale still a question, but its the future, so its fine.

Your hole teleportation was a neat idea, not so much how you explained it would be done with the beam and such, but just pointing out the amount of space between atoms, so by getting around the charges, you'd be able to move through (some) forms of matter. If you use this one, think it out some more and do some more research on it, intruiging idea, needs a bit of tweaking though I think.

you`ll need a huge capacitor! with a fast duty cycle' date=' charge it from and NST or OBIT and that`ll work well, as for the car batt, you`ll risk overheating it as the current drain to stepup would be enormous! for a workable charge.

failing that, maybe you can get a pole pig from a scrap yard? some have them to burn out and strip the copper, Army/Navy surplus stores are also handy if you can get an old Radar transformer and the caps used in them, all or any should work just fine [/quote']

 

Whats a pole pig?

 

Yeah I've heard I will need a capacitor, but I was hoping to get around that by simply having a very very tiny rail gun. Like, 15cm long rails with a penny as a projectile.

 

I've done extensive google searches on the subject, so I've already seen the powerlabs site, that little em toys one or whatever it was, and a variety of other ones. But they all deal with rail guns way way larger than one I intend to build (aside from the em toys one, but I dont have any super powerful magnets at the moment).

 

All I want, is a number, in amperes, for getting something the size of a penny moving. Not fast, just enough to overcome friction. Considering the small size, I thought that a car battery alone would be enough for the job, without a capacitor. Is this completly wrong?

 

Thanks for the input, keep it up!

Wear some sort of conducting mesh over non-conducting materiel. Allow some of the metal to touch the ground, so as to allow the electricity to flow through the metal and into the ground, instead of into your body (which isn't a good conductor compared to metal).

You can be the one that tests it.

That would be me (the one who is doing the rail gun).

So... nobody can offer me any sort of energy estimate at all? Not even for a super tiny one?

Use the mains as your power supply' date=' and a sharpened lawn umbrella as your projectile.

 

:thumbsup:[/quote']

 

I... see.

Uh, perhaps I should elaborate here. This is just a grade 11 physics class. I am not planning on making so much a rail "gun" as a rail "move a penny a bit". If I can get my projectile to move the length of the rails, I will be happy. I'm not looking for some super power thing here. What would be the minimum current requirements for this, just to move a coin a little bit.

First off, I'm not sure if this is the right place to post this topic, but I didn't see an electromagnetic forum. If one exists, then I am blind and i will repost this there.

Anywho. For a school physics project I am doing rail guns. I know the basics principals of how they work, and how to build one. The one I will build need only be very small, just big enough to demonstrate that they can work, so my projectile will probably be a penny or something of similar mass. What I am wondering is, what sort of power am I looking at to get this thing moving? I know the more current the better, but how much, and where might I aqquire this? I am considering a car battery, but this may be over kill or not enough, I do not know. Any help would be appreciated.